1. Has the header been cold-drilled?

2. Whether the position of the air escape hole can fully escape the air,

3. Is it plastic wavefront stitching? (The bigger the finished product, the easier it is to appear in the rubber mouth. )

According to your description, it is closer to the possibility of the third question, because your finished product is very large and poured by the central government.

S-shape should be the shape of waste head, not the glue inlet.

The solution can be to use a larger injection machine to increase the firing rate and fill the finished product before the plastic cools.

Improve the plastic molding temperature (avoid the mold temperature lowering the raw material temperature),

Increase the mold temperature (avoid the mold temperature lowering the raw material temperature),

Increase the holding pressure (can reduce suture marks)